2121 形状記憶合金の原子炉内補修技術への応用(S06-4 形状記憶合金の特性と応用技術(4),S06 形状記憶合金の特性と応用技術)

概要

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The Ti-Ni-Nb shape memory alloy has a high transformation temperature hysteresis, and is thus being used in pipe joints and similar applications. The Ti-Ni-Nb shape memory alloy is applied to repair technique in the nuclear reactor. Several Ti-Ni-Nb shape memory alloys with various Nb contents (6,9mol%) or Ni/Ti ratio 1.088 were tested to examine the effect of pre-strain and heat treatment on shape recovery stress and phase transformation temperatures. The recovery stress of Ti-Ni-Nb alloys increased with increase of pre-strain, and it became the maximum just over or below 9% beforehand. Moreover, the maximum recovery stress at that time was 450-500MPa. Transformation temperatures (Ms, As, Af) also increased with the pre-strain.
2007-09-07